My old thread Here Had alot of great ideas and support, so i decided to compile a list of bows that are transmog worthy.
Here is a list of bows that many of you have seen before, and some that you haven't
Golden Bow of Quel'Thalas
Rhok'delar, Longbow of the Ancient Keepers No Longer Obtainable
Black Bow of the Betrayer
Sunfury Bow of the Phoenix
Melmorta's Twilight Longbow
Bristleblitz Striker
Ancient Amani Longbow No Longer Obtainable
Lohn'goron, Bow of the Torn-Heart
Heartstriker
Siren's Cry
Skyfire Hawk-Bow
Avalanche
Ancient Bone Bow
Crypt Fiend Slayer
Njorndar Bone Bow - Heroic Version Here
Zod's Repeating Longbow - Heroic Version Here
Accursed Bow of the Elite
Frenzystrike Longbow Horde Only
Rhok'shalla, the Shadow's Bane Alliance Only
Wrathtide Longbow
Arrowsong
Golemheart Longbow
Starbolt Longbow
Overpowered Chicken Splitter
Titanium Compound Bow Similar Model -Horde Only
Drakkari Hunting Bow
Brutal Gladiator's Longbow
Bow of Taut Sinew
Huhuran's Stinger
If you find any more good looking bows, feel free to post a link and I'll add them to the list.